Example Questions

Example Question #1 : Dsq: Calculating The Length Of A Side Of A Polygon

Note: Figure NOT drawn to scale.

Refer to the above diagram. Evaluate .

Statement 1:

Statement 2:

Possible Answers:

Either alone

xxx

Correct answer:

Either alone

Explanation:

Refer to the figure below, in which has been constructed, and the top and right sides of the figure have been extended to their intersection to form Rectangle .

Assume Statement 1 alone. Since opposite sides of a rectangle have the same length, . By segment addition, , and, since , by substitution, . Therefore, , and the Pythagorean Theorem can be used to find :

Since opposite sides of a rectangle have the same length, , and by segment addition, . By substitution, , and .

Assume Statement 2 alone. Since , the hypotenuse of right triangle , and , one of its legs, have lengths 15 and 12, respectively, the length of the other leg can be found using the Pythagorean Theorem:

Example Question #2 : Dsq: Calculating The Length Of A Side Of A Polygon

Note: Figure NOT drawn to scale

Refer to the above figure. Give the length of .

Statement 1:

Statement 2:

Possible Answers:

Statement 1 ALONE is sufficient to answer the question, but Statement 2 ALONE is NOT sufficient to answer the question.

Statement 2 ALONE is sufficient to answer the question, but Statement 1 ALONE is NOT sufficient to answer the question.

EITHER statement ALONE is sufficient to answer the question.

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

BOTH statements TOGETHER are insufficient to answer the question.

Correct answer:

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

Explanation:

We can construct perpendicular line segments from to and from to as follows:

is the hypotenuse of a right triangle , so if we can determine the lengths of and , we can use the Pythagorean Theorem to determine the length of .

Assume Statement 1 alone. By segment addition, . Since and are opposite sides of a rectangle, ; similarly, . It follows by substitution that . Since , it follows that , and . However, no additional information exists to find .

Assume Statement alone. By similar reasoning, ; since , , and . However, no information exists to find .

The two statements put together, however, yield both necessary values: and . By the Pythagorean Theorem,

Example Question #4 : Dsq: Calculating The Length Of A Side Of A Polygon

Given a regular hexagon , what is the length of ?

Statement 1: The hexagon is circumscribed by a circle with circumference .

Statement 2: hs length 12.

Possible Answers:

BOTH statements TOGETHER are insufficient to answer the question.

Statement 2 ALONE is sufficient to answer the question, but Statement 1 ALONE is NOT sufficient to answer the question.

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

EITHER statement ALONE is sufficient to answer the question.

Statement 1 ALONE is sufficient to answer the question, but Statement 2 ALONE is NOT sufficient to answer the question.

Correct answer:

EITHER statement ALONE is sufficient to answer the question.

Explanation:

Below is a regular hexagon , with its three diameters, its center , and its circumscribed circle, which also has center .

If Statement 1 is true. then the circle, with circumference , has as its diameter , which is 12; this makes the two statements equivalent, so we need only establish that one statement is sufficient or insufficient.

Either way, , the radius of the hexagon, is 6. The six triangles that are formed by the sides and diameters of a regular hexagon are all equilateral by symmetry, so each side of the hexagon - in particular, - has length 6.

Example Question #6 : Dsq: Calculating The Length Of A Side Of A Polygon

Give the length of side of Pentagon .

Statement 1:

Statement 2: and both have length 10.

Possible Answers:

Statement 2 ALONE is sufficient to answer the question, but Statement 1 ALONE is NOT sufficient to answer the question.

Statement 1 ALONE is sufficient to answer the question, but Statement 2 ALONE is NOT sufficient to answer the question.

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

BOTH statements TOGETHER are insufficient to answer the question.

EITHER statement ALONE is sufficient to answer the question.

Correct answer:

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

Explanation:

Statement 1 alone states that is congruent to two other sides, but gives no actual measurements. Statement 2 alone gives the actual measurements of two other segments, but without further information, such as how their lengths relates to that of , no information about can be inferred.

Now, assume both statements to be true. From Statement 2, has length 10, and from Statement 2, , which is the same line segment (which can be named after its endpoints in either order), has the same length as . Therefore, .

Example Question #7 : Dsq: Calculating The Length Of A Side Of A Polygon

Give the length of side of Pentagon .

Statement 1: Pentagon has perimeter 50.

Statement 2:

Possible Answers:

Statement 1 ALONE gives sufficient information to answer the question, but Statement 2 ALONE does NOT sufficient information to answer the question.

EITHER statement ALONE gives sufficient information to answer the question.

Statement 2 ALONE gives sufficient information to answer the question, but Statement 2 ALONE does NOT sufficient information to answer the question.

BOTH statements TOGETHER do not give sufficient information to answer the question.

BOTH statements TOGETHER give sufficient information to answer the question, but neither statement ALONE gives sufficient information to answer the question.

Correct answer:

Statement 2 ALONE gives sufficient information to answer the question, but Statement 2 ALONE does NOT sufficient information to answer the question.

Explanation:

Statement 1 alone only gives the perimeter - the sum of the lengths of the sides - but gives no information about the individual sidelengths. (In particular, there is no indication that the pentagon is regular).

Assume Statement 2 alone. and are two names for the same line segment, which can be named after its endpoints in either order. Therefore, .

Example Question #9 : Dsq: Calculating The Length Of A Side Of A Polygon

True or false: is the longest side of Hexagon .

Statement 1:

Statement 2: Hexagon has perimeter 66.

Possible Answers:

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

Either statement ALONE is sufficient to answer the question.

Statement 2 ALONE is sufficient to answer the question, but Statement 1 ALONE is NOT sufficient to answer the question.

BOTH statements TOGETHER are insufficient to answer the question.

Statement 1 ALONE is sufficient to answer the question, but Statement 2 ALONE is NOT sufficient to answer the question.

Correct answer:

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

Explanation:

Statement 1 alone only gives information about one side of the hexagon, and Statement 2 gives only information about the perimeter without giving any clues as to the individual sidelengths; neither is sufficient to answer the question.

Assume both statements are true. If , with length 10, is the longest side of Hexagon , then

By the addition property of inequality,

This means the sum of the sidelengths of the hexagon, which is its perimeter, is less than 66, in contradiction to Statement 2. cannot be the longest side.

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